Be a creator than being an user

It’s not an easy task to estimate the total required storage for a content database in SharePoint 2013, since it depends on many factors as number of documents, versioning, amount of deleted files in recycle bin, Metadata used for each file and amount of list items. There is a formula for calculating the size and it should be used to give an approximation, not an exact value. The growth of the database must be measured during a time period to be able to establish a baseline.

Content Database size = ((D x V) x S) + (10 KB x (L + (V x D)))

D = Number of DocumentsV = Number of VersionsS = Average Size of documents. Must be above Zero!L =Number of List items10 KB = Average size of metadata that SharePoint store for each file

Some reminders:
Maximum content databases per farm are 500
Maximum supported size of content database for general usage scenarios is 200 GB
Maximum supported size of content database for all other usage scenarios is 4 TB. Some conditions must be met when using content databases larger than 4 TB. Read more here:

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